Share 'Email lists and your campus'

Hey everyone,
It keeps being brought up on campus that we don't have a consolidated email list of who has opted out and who actually wants to be emailed. We have a few different systems that we use for sending email to different audiences. We'd like to create a "data warehouse" (for lack of a better term) to keep a master list of everyone and not have these emails in different silos.
Can anyo…